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a in (-oo:+oo)
(1/15)*(a-5) = (1/9)*(4-a) // - (1/9)*(4-a)
(1/15)*(a-5)-((1/9)*(4-a)) = 0
(1/15)*(a-5)+(-1/9)*(4-a) = 0
1/15*(a-5)-1/9*(4-a) = 0
1/15*(a-5)-1/9*(4-a) = 0
8/45*a-7/9 = 0
8/45*a-7/9 = 0
8/45*a-7/9 = 0 // + 7/9
8/45*a = 7/9 // : 8/45
a = 7/9/8/45
a = 35/8
a = 35/8
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